EP0476083B1 - Bearbeitungseinheit mit drehendem kopf, der schwenkbare werkzeuge trägt - Google Patents

Bearbeitungseinheit mit drehendem kopf, der schwenkbare werkzeuge trägt Download PDF

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Publication number
EP0476083B1
EP0476083B1 EP91905511A EP91905511A EP0476083B1 EP 0476083 B1 EP0476083 B1 EP 0476083B1 EP 91905511 A EP91905511 A EP 91905511A EP 91905511 A EP91905511 A EP 91905511A EP 0476083 B1 EP0476083 B1 EP 0476083B1
Authority
EP
European Patent Office
Prior art keywords
machining unit
tool
pivoting
rotary
unit according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91905511A
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English (en)
French (fr)
Other versions
EP0476083A1 (de
Inventor
Daniel Evard
Pierre-Louis Piguet
Hubert Rossetti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Esco SA
Original Assignee
Esco SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Esco SA filed Critical Esco SA
Publication of EP0476083A1 publication Critical patent/EP0476083A1/de
Application granted granted Critical
Publication of EP0476083B1 publication Critical patent/EP0476083B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/24—Tool holders for a plurality of cutting tools, e.g. turrets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/16—Severing or cut-off
    • Y10T82/16426—Infeed means
    • Y10T82/16442—Infeed means with means to circumrotate tool[s] about work
    • Y10T82/16475—Gear means for tool actuation
    • Y10T82/16491—Gear means for tool actuation including axial cam
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2527—Lathe having hollow cutter head

Definitions

  • Rotating heads with turning tools have long been used for bar turning. They allow parts to be machined from metallic material in the form of a very long wire which is axially advanced through the rotor. Units of this kind which are currently on the market generally have two or three tools, some of which are controlled independently. To avoid problems due to centrifugal acceleration resulting from the rotation of the head, the tool supports are pivotable around respective axes eccentric to the axis of rotation.
  • the means for controlling the pivoting of the tool supports play an essential role in the performance of the machine from the point of view of precision and working speed.
  • a known system EP-A-0 278 898
  • the pivoting of two tool holders in opposite directions is controlled by means of a rotary element with a conical surface against which the control lever of each corresponding support is supported.
  • This element is integral with a sliding ring moved by means of a translation mechanism. The lever is held in abutment against the conical surface by the effect of centrifugal acceleration acting on a counterweight, so that the transmission is free of play.
  • the European patent application N o 12'154 describes a rotary head carrying a pair of opposed tools each having a pivot support supported by a spring and supported by a radially adjustable slide. The position of the slides is controlled by axial displacement of a bell with a conical inner surface against which the slides are supported. This control mechanism located relatively far from the axis of rotation is large and heavy and does not allow each tool to be controlled separately.
  • US Patent No 3'866'495 and 3'817'130 show other examples of rotary heads having a sliding cone device which controls the radial position of several tools placed symmetrically.
  • German patent application N o 1′104′289 describes a lighter mechanism, comprising several control rings which can pivot separately and comprising support surfaces in the form of a spiral, but it is a stationary guide device matter and not tools. This mechanism is not rotary and therefore does not present the problems due to centrifugal forces.
  • the present invention aims to overcome the drawbacks mentioned above, by providing a rotary head equipped with pivot control means ensuring high precision and allowing a simple and compact construction which allows high rotational speeds.
  • each guide surface corresponding to a pivoting tool support has the shape of a portion of a helix whose axis coincides with the pivot axis of said support.
  • said bearing surface is a cylindrical surface with generatrices perpendicular to said pivot axis.
  • said directing surface is located on the tool support and the corresponding bearing surface is located on the rotary control element.
  • the levers of two tool supports cooperate with the same rotary control element so that, during a translation of said element, a tool fixed to one of the supports approaches the axis of rotation while a tool attached to the other support moves away from this axis, their helical guide surfaces having respective steps of opposite directions.
  • a preferred form of the machining unit comprises two rotary control elements, independently movable in translation and each having an annular shape, these elements being formed respectively by an inner sleeve, surrounding the spindle and provided with at least one surface d support on its outer face, and by an outer sleeve surrounding the inner sleeve and provided with at least one bearing surface on its inner face.
  • the rotary head can be equipped with four tool supports, two of which are pivotally controlled by the inner sleeve, coupled to a first translation device, and the other two are pivotally controlled by the outer sleeve, coupled to the second. translation device.
  • the four guide surfaces of the tool supports are in substantially the same longitudinal position along the spindle.
  • the four tool supports may include respective tool holders which are located substantially in the same transverse plane.
  • each translation device comprises a non-rotating ring, coupled to the rotary control element by means of bearings, and a linear actuator coupled to said ring by means of '' a swivel fork mechanism.
  • said non-rotating ring cooperates with a linear displacement sensor, connected to a digital control device acting on said actuator.
  • the machining unit comprises a frame 1 in which is mounted a rotor 2 rotating around an axis 3 and comprising a machining head 4, a hollow spindle 5 integral with this head, four tool supports 6a-6d pivoting around respective pivot axes 7a-7d parallel to the axis 3, as well as means for controlling the pivoting of the supports 6a-6d.
  • the spindle 5 is provided with an axial duct 8 through which the material to be machined passes in the form of a bar or a rigid wire. In the area of the machining head 4, this material is guided by a non-rotating guide barrel 9, mounted on preloaded bearings with oblique contact 10 and integral in rotation with a tube 11 preventing it from rotating.
  • the spindle 5 is equipped with a pulley 12.
  • the tube 11 is retained against rotation in a complementary module 13 which contains a clamp device 14 ensuring the maintenance and advance of the material during machining and after the completion of a part.
  • this device is preferably controlled by means of a digital control, the elements of which are not shown.
  • the machining head 4 forms an approximately cylindrical block, supported in the frame by an angular contact bearing 16 at the front and by two oblique contact bearings 17 at the rear.
  • the latter are mounted in parallel in a sliding bushing 18 preloaded axially by springs 19 pressing against the frame 1.
  • the preload of the bearings 16 and 17 arranged in opposition is kept constant whatever the dimensional variations of the elements, particular of spindle 5.
  • the widespread use of precision angular contact bearings makes it possible to achieve a low vibration level, as well as high rotational speeds.
  • each tool holder 6a to 6d has a removable tool holder arm 20a-20d.
  • the trajectory of four chisels 21a to 21d can go at least up to the axis of rotation 3, which makes it possible to machine a piece of any diameter and cut at the end of the machining.
  • the part being machined can be held by an axial clamp (not shown) external to the machining unit.
  • the tool holders 20a-20d are advantageously located in the same transverse plane. To clarify the drawing, they are not shown in Figures 2 and 3.
  • Figures 1 to 6 show that each of the tool supports 6a-6d has a cylindrical central part 22a-22d mounted on needle bearings 27 and, on the back of the head 4 (fig. 4), it is widened under the form of a control lever 23a-23d and a counterweight 24a-24d.
  • the free end of the control lever 23a-23d laterally carries a hard metal plate 25a-25d having a helical guide surface 26a-26d.
  • each of these surfaces is a portion of a propeller surface whose axis is precisely the pivot axis 7a-7d of the corresponding tool support.
  • the respective directions of the helices of the two guide surfaces 26a and 26b are opposite to each other. The same is true for the two guiding surfaces 26c and 26d.
  • the pivoting of the tool supports 6a and 6b is controlled by the sliding of a rotary internal sleeve 30 which surrounds the spindle 5 and rotates with it, this sleeve 30 being guided in axial sliding by a key 31. It is provided with two protrusions 32a and 32b (Fig. 4) having respective bearing surfaces, such as 33a, which are applied against the guide surfaces 26a and 26b, along which they slide when the inner sleeve 30 is moved axially. These bearing surfaces are portions of cylinders whose generatrices are perpendicular to the respective axes 7a, 7b, that is to say that the support is linear, and not punctual, along a common generatrix of the cylindrical bearing surface and helical guide surface. This results in a decrease in contact pressure and wear, and in the long term an improvement in the precision of the pivoting control.
  • the axial sliding of the inner bush 30 is controlled by means of a translation device 34 (FIGS. 2 and 3) having a non-rotating ring 35 mounted on the bush 30 by means of two bearings without play 36.
  • This ring comprises two opposite notches in which two shoes 37 can slide, pivotally carried by a fork lever 38, which is mounted on the frame 1 so as to pivot around a vertical axis 39 defined by bearings free of play, under the effect of a linear actuator 40 to which the arm is connected by a connecting rod 41.
  • the actuator 40 is parallel to the axis 3 and it can be hydraulic, electromechanical or other.
  • the system for measuring the displacement of the sleeve 30, therefore of the pivoting of the tools can be attached directly to the non-rotating ring 35, which eliminates from the measurement any inaccuracy which may occur in the translation device 34.
  • the bearing surface 33a slides on the directing surface 26a in the direction of the left in the case of FIG. 5 and pushes towards outside the lever 23a, which rotates the tool support 6a so that the chisel 21a approaches the axis 3 and attacks the workpiece.
  • the tool support 6b pivots in the opposite direction since its helical guide surface is in the opposite direction, so that the chisel 21b moves away from the workpiece.
  • the two other pivoting tool supports 6c and 6d are controlled in a similar manner, but by being pressed outwards against an external rotary sleeve 42 surrounding the internal sleeve 30 and mounted in a sliding manner in a tubular piece 44 of the rotor 2.
  • This part 44 is fixed by means of screws 45 and thus serves to block the bearing 16 on the rotary head 4.
  • the external bush 42 presses on the guiding surfaces 26c and 26d by surfaces of support such as 46c, materialized in this example by cylindrical bars 47c, 47d made of hard metal, inserted and glued in housings formed on the inner face of the socket 42. These bars have generators perpendicular to the axes 7c, 7d of the guiding surfaces helical 26c, 26d and they are therefore in linear contact with them.
  • the inner sleeve 30 has, in the middle part of its length, three openings 48 arranged at 120 ° from one another, in which there are three guide pads 49 fixed by screws 50 to the pin 5. These pads support the part rear of the outer sleeve 42 and guide it axially by means of keys 51 engaged in grooves of the sleeve 42.
  • the sliding of the sleeve 42 is controlled by a translation device 53, similar to device 34 and comprising like it a non-rotating ring 54 carried by a pair of bearings 52, sliding shoes 57, a fork lever 55 and a linear actuator 56 controlled independently of the actuator 40. Again, an operation of the actuator 56 rotates one of the tool supports 6c, 6d in one direction and the other in the opposite direction.
  • each of the translation devices 34 and 53 In a middle position of each of the translation devices 34 and 53, none of the four tools 6a to 6d is in contact with the workpiece. From this position, any of the four tools can be brought to the workpiece if the corresponding actuator 40, 56 is operated in the appropriate direction.
  • each of the inner 30 and outer bushings 42 controls two adjacent tools, it is possible to actuate simultaneously, but independently, two chisels opposite to the workpiece, for example chisels 21a and 21c.
  • the machining unit according to the invention has a much simpler and more compact construction, although it may include up to four different tools, compared to a maximum of three tools in current machines. Thanks to the reduced dimensions of the rotor and to the annular shape of the two rotary sockets 30 and 42 absorbing the support forces which result from centrifugal acceleration, a particularly rigid rotor is obtained, having a low vibratory level, which makes it possible to increase the speed of rotation, for example up to approximately 12,000 rpm for an inside diameter of 80 mm of the bearing 16 of the machining head, compared to a speed of approximately 8,000 rpm in current machines.
  • the present invention is not limited to the embodiment described above, but it extends to any modification or variant obvious to a person skilled in the art.
  • a simpler machining head can be designed according to the same principles, having only a pair of tools and a single translation device for controlling these two tools.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turning (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Machine Tool Units (AREA)

Claims (10)

  1. Bearbeitungseinheit mit drehendem Kopf, der mindestens zwei schwenkbare Werkzeuge trägt, für die Bearbeitung eines nicht drehenden Werkstückes, das auf der Drehachse des Kopfes zentriert ist, bestehend aus:
    - einem Gestell, auf dem ein Rotor montiert ist, der aus dem drehenden Kopf und einer Spindel, die mit diesem Kopf fest verbunden ist, besteht, wobei der Rotor mit einem axialen Rotor versehen ist und mit Einrichtungen für den Antrieb einer Drehbewegung gekoppelt ist;
    - Einrichtungen für die axiale Führung des Werkstückes, wobei diese Einrichtungen mit Hilfe von Lagern in der Spindel oder in dem drehenden Kopf eingebaut sind;
    - Einrichtungen für das Festhalten und für die axiale Verstellung des Werkstückes;
    - mindestens zwei Supporte für die Werkzeuge, die in dem drehenden Kopf derart eingebaut sind, daß sie um die jeweiligen Achsen, die zu der drehen- den Achse parallel sind, schwenken können, wobei jeder Support einen Betätigungshebel besitzt, der quer angeordnet ist,
    - und Einrichtungen für die Steuerung der Schwenk- bewegung, die mit den besagten Hebeln zusammen- wirken und mindestens aus einem drehenden Steuerungsteil, das für eine axiale Verschiebung in dem Rotor beweglich und mit einer Steuereinrichtung für die Verschiebung gekoppelt ist, und aus Paaren von Stützen, die jeweils auf jedem der Betätigungshebel und auf dem entsprechenden drehenden Steuerungsteil angeordnet sind, bestehen, wobei jedes Paar von Stützen, das aus einer Leitfläche und aus einer Stützfläche besteht, gegen die Leitfläche in einer veränderlichen Lage in Abhängigkeit von der Verschiebung des drehenden Steuerungsteils aufliegt,
    dadurch gekennzeichnet, daß jede Leitfläche (26a-26d), die einem schwenkenden Werkzeugsupport (6a-6d) entspricht, die Form eines Schneckenteiles besitzt, dessen Achse mit der Schwenkachse (7a-7d) des besagten Supports zusammenfällt.
  2. Bearbeitungseinheit nach Anspruch 1,
    dadurch gekennzeichnet, daß die besagte Stützfläche (33a,46c) eine zylindrische Fläche mit Erzeugenden bzw. Mantellinien, die zu der besagten Schwenkachse (7a,7c) senkrecht sind, ist.
  3. Bearbeitungseinheit nach Anspruch 1,
    dadurch gekennzeichnet, daß die besagte Leitfläche (26a-26d) sich auf dem Werkzeugsupport (6a-6d) befindet und die entsprechende Stützfläche sich auf dem drehenden Steuerungsteil (30,42) befindet.
  4. Bearbeitungseinheit nach Anspruch 1,
    dadurch gekennzeichnet, daß die Hebel (23a-23d) von zwei Werkzeugsupporten (6a und 6b; 6c und 6d) mit ein und demselben drehenden Steuerungsteil (30,42) derart zusammenwirken, daß während einer Verschiebung des besagten Steuerungsteiles ein Werkzeug, das auf einem der Supporte befestigt ist, sich an die Drehachse nähert, während ein Werkzeug, das an dem anderen Support befestigt ist, sich von dieser Achse entfernt, da deren schneckenförmige Leitflächen (26a und 26b) jeweilige Steigungen von entgegengesetzten Richtungen besitzen.
  5. Bearbeitungseinheit nach Anspruch 3,
    dadurch gekennzeichnet, daß sie zwei drehende Steuerungsteile (30,42) enthält, die für eine Verschiebung unabhängig beweglich sind und jeweils eine Ringform aufweisen, wobei jeder dieser Teile aus einer inneren Buchse (30), die die Spindel (5) umgibt und auf ihrer außenliegenden Seite mindestens mit einer Stützfläche (33a) versehen ist, und aus einer außenliegenden Buchse (42), die die innere Buchse (30) umgibt und auf ihrer inneren Seite mit einer Stützfläche (46c) versehen ist.
  6. Bearbeitungseinheit nach Anspruch 4 und 5,
    dadurch gekennzeichnet, daß der drehende Kopf (4) mit vier Supporten für Werkzeuge (6a-6d) ausgerüstet ist, wovon zwei durch die innere Buchse (30), die mit einer ersten Einrichtung für eine Verschiebung (34) gekoppelt ist, für eine Schwenkbewegung gesteuert werden und die zwei anderen Werkzeugsupporte durch die außenliegende Buchse (42), die mit einer zweiten Einrichtung für eine Verschiebung (53) gekoppelt ist, für eine Schwenkbewegung gesteuert werden.
  7. Bearbeitungseinheit nach Anspruch 6,
    dadurch gekennzeichnet, daß die vier Leitflächen (26a-26d) der Werkzeugsupporte sich etwa in der gleichen longitudinalen Stellung entlang der Spindel (5) befinden.
  8. Bearbeitungseinheit nach Anspruch 6,
    dadurch gekennzeichnet, daß die vier Werkzeugsupporte (6a-6d) jeweilige Werkzeughalter (20a-20d) besitzen, die etwa in einer gleichen querliegenden Ebene angeordnet sind.
  9. Bearbeitungseinheit nach Anspruch 1,
    dadurch gekennzeichnet, daß jede Einrichtung für eine Verschiebung (34,53) einen nicht drehenden Ring (35,54), der mit dem drehenden Steuerungsteil (30,42) mit Hilfe von Wälzlagern gekoppelt ist, und ein lineares Stellgerät (40,56), das mit dem besagten Ring mit Hilfe einer mechanischen Einrichtung mit schwenkbarer Gabel (38,55) gekoppelt ist, besitzt.
  10. Bearbeitungseinheit nach Anspruch 9,
    dadurch gekennzeichnet, daß der besagte nicht drehende Ring (35,54) mit einem linearen Verstellungsgeber (60,61) zusammenwirkt, der mit einer Vorrichtung für numerische Steuerung, die auf dem besagten Stellgerät (40,56) wirkt, verbunden ist.
EP91905511A 1990-03-26 1991-03-21 Bearbeitungseinheit mit drehendem kopf, der schwenkbare werkzeuge trägt Expired - Lifetime EP0476083B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9003993A FR2659881A1 (fr) 1990-03-26 1990-03-26 Unite d'usinage a tete rotative portant des outils pivotants.
FR9003993 1990-03-26
PCT/CH1991/000070 WO1991014527A1 (fr) 1990-03-26 1991-03-21 Unite d'usinage a tete rotative portant des outils pivotants

Publications (2)

Publication Number Publication Date
EP0476083A1 EP0476083A1 (de) 1992-03-25
EP0476083B1 true EP0476083B1 (de) 1994-06-01

Family

ID=9395225

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91905511A Expired - Lifetime EP0476083B1 (de) 1990-03-26 1991-03-21 Bearbeitungseinheit mit drehendem kopf, der schwenkbare werkzeuge trägt

Country Status (7)

Country Link
US (1) US5207136A (de)
EP (1) EP0476083B1 (de)
JP (1) JPH04506774A (de)
AT (1) ATE106293T1 (de)
DE (1) DE69102236T2 (de)
FR (1) FR2659881A1 (de)
WO (1) WO1991014527A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101927374A (zh) * 2010-08-25 2010-12-29 柳州欧维姆机械股份有限公司 轴类回转工件不转动加工外圆机床

Families Citing this family (12)

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Publication number Priority date Publication date Assignee Title
FR2752760B1 (fr) * 1996-09-02 1998-10-30 Esco Sa Unite d'usinage a tete rotative
GB9824240D0 (en) * 1998-11-06 1998-12-30 Graham Labelling Systems Limit Sleeve cutting apparatus
US6367360B1 (en) * 1999-12-13 2002-04-09 Plastipak Packaging, Inc. Apparatus for trimming plastic blow moldings
DE10140925B4 (de) * 2001-08-15 2007-08-02 ITT Manufacturing Enterprises, Inc., Wilmington Vorrichtung zum Entschichten von Rohren
JP2004254027A (ja) * 2003-02-19 2004-09-09 Toshiba Corp サーバ装置、鍵管理装置、暗号通信方法及びプログラム
US6829971B1 (en) * 2003-06-04 2004-12-14 Chien-Tsai Huang Cutting fixture for heat-shrink film sleeve labeling machines
JP4211929B2 (ja) * 2003-10-31 2009-01-21 富士機械製造株式会社 切断装置
US7478982B2 (en) * 2006-10-24 2009-01-20 Baker Hughes, Incorporated Tubular cutting device
CN104084605B (zh) * 2014-07-07 2017-01-25 江苏斯普瑞科技有限公司 一种现场车削设备
WO2018189612A1 (fr) * 2017-04-11 2018-10-18 Ventura Mecanics Sa Machine de tournage inversé
CH714626A2 (fr) * 2018-02-06 2019-08-15 Ventura Mecanics Sa Porte-outils et machine de tournage inversé comportant un tel porte-outils.
CH718197B1 (fr) * 2020-12-21 2024-12-30 Esco Sa Unité d'usinage à tête rotative.

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DE7311C (de) * G. LIECKFELD, Ingenieur, in Hannover, Gr. Barlinge 37 Frictions-Schlofs
US1646758A (en) * 1926-12-07 1927-10-25 Int Motor Co Lathe attachment for turning irregular profiles
GB358727A (en) * 1929-11-22 1931-10-15 Friedrich Mulka Improvements in or relating to controlling means for automatic lathes
DE1104289B (de) * 1958-11-06 1961-04-06 Kieserling & Albrecht Einrichtung zum Fuehren der Werkstuecke bei Schaelmaschinen
DE1602870B1 (de) * 1967-02-10 1970-05-21 Hans Lindemann Schaelmaschine
DE2220984C2 (de) * 1972-04-28 1974-03-21 Kieserling & Albrecht Einrichtung an Schaelmaschinen fuer Stranggut wie beispielsweise Walzdraht
US3866495A (en) * 1972-08-08 1975-02-18 Kieserling & Albrecht Method and apparatus for shaving elongated workpieces
DE2842436A1 (de) * 1978-09-29 1980-04-17 Kieserling & Albrecht Messerkopf zum kopierschaelen von stangen, rohren und draht

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101927374A (zh) * 2010-08-25 2010-12-29 柳州欧维姆机械股份有限公司 轴类回转工件不转动加工外圆机床
CN101927374B (zh) * 2010-08-25 2013-07-03 柳州欧维姆机械股份有限公司 轴类回转工件不转动加工外圆机床

Also Published As

Publication number Publication date
US5207136A (en) 1993-05-04
WO1991014527A1 (fr) 1991-10-03
FR2659881A1 (fr) 1991-09-27
EP0476083A1 (de) 1992-03-25
ATE106293T1 (de) 1994-06-15
JPH04506774A (ja) 1992-11-26
DE69102236T2 (de) 1994-11-03
DE69102236D1 (de) 1994-07-07

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